Medically reviewed by Daniel Combs, MD Benadryl (diphenhydramine) is an over-the-counter (OTC) antihistamine commonly used to treat allergies that is also sometimes used as a sleep aid for insomnia.

Objective: To reinvigorate the brand and reclaim dominance in a highly competitive market. Results: In a mature and highly competitive market, Benadryl achieved 31 per cent growth and 600 per cent ROI ...

Benadryl is available without a prescription. Dogs on other medications, dogs with ocular problems like glaucoma, and any other dogs with health problems, like seizures, should not be given ...